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The characteristic impedance of a transmission line is normally chosen to be

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The characteristic impedance of a transmission line is normally chosen to be

(a) 50

(b) 75

(c) 50 or 75

(d) 100

This question was addressed to me in homework.

My question is from Input and Characteristic Impedances topic in portion Transmission Lines of Electromagnetic Theory

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Right answer is (c) 50 or 75

Easiest explanation: The characteristic impedance is always 50 ohm or 75 ohm for a transmission line. This is because of the GHz range of operation and the load impedences employed.

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